CN113135176B - Mode switching control method and device of hybrid vehicle and vehicle - Google Patents

Mode switching control method and device of hybrid vehicle and vehicle Download PDF

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Publication number
CN113135176B
CN113135176B CN202010643067.2A CN202010643067A CN113135176B CN 113135176 B CN113135176 B CN 113135176B CN 202010643067 A CN202010643067 A CN 202010643067A CN 113135176 B CN113135176 B CN 113135176B
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gear
vehicle
hybrid
hybrid vehicle
speed
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CN113135176A (en
Inventor
亢通
陈淑江
赵晴
周明旺
吴迪
刘寒
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Great Wall Motor Co Ltd
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Great Wall Motor Co Ltd
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Priority to CN202010643067.2A priority Critical patent/CN113135176B/en
Priority to EP21838932.8A priority patent/EP4155147A4/en
Priority to PCT/CN2021/103841 priority patent/WO2022007688A1/en
Priority to US17/927,048 priority patent/US20230202457A1/en
Publication of CN113135176A publication Critical patent/CN113135176A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/42—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by the architecture of the hybrid electric vehicle
    • B60K6/44—Series-parallel type
    • B60K6/442—Series-parallel switching type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/02—Conjoint control of vehicle sub-units of different type or different function including control of driveline clutches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/10—Conjoint control of vehicle sub-units of different type or different function including control of change-speed gearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/10—Conjoint control of vehicle sub-units of different type or different function including control of change-speed gearings
    • B60W10/11—Stepped gearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/20—Control strategies involving selection of hybrid configuration, e.g. selection between series or parallel configuration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/40—Controlling the engagement or disengagement of prime movers, e.g. for transition between prime movers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/18—Propelling the vehicle
    • B60W30/182—Selecting between different operative modes, e.g. comfort and performance modes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/10—Change speed gearings
    • B60W2510/1005—Transmission ratio engaged
    • B60W2510/101—Transmission neutral state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2520/00—Input parameters relating to overall vehicle dynamics
    • B60W2520/10—Longitudinal speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2540/00—Input parameters relating to occupants
    • B60W2540/16—Ratio selector position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/02—Clutches
    • B60W2710/021—Clutch engagement state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/10—Change speed gearings
    • B60W2710/1005—Transmission ratio engaged
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/62—Hybrid vehicles

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Transmission Device (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Hybrid Electric Vehicles (AREA)

Abstract

The disclosure relates to a mode switching control method and device for a hybrid vehicle and the vehicle, belonging to the field of hybrid vehicles, wherein the method comprises the following steps: and if the running state information indicates that the current driving mode of the hybrid vehicle is a non-hybrid driving forward mode and the current vehicle speed reaches a speed limit value under the condition that the transmission gear of the vehicle is in a neutral gear, executing a pre-gear operation to switch the transmission gear from the neutral gear to a second gear. The technical scheme provided by the embodiment of the disclosure can ensure that the hybrid vehicle cannot be switched to the hybrid driving mode due to the limitation of the performance of the synchronizer on the gear under the condition of high-speed running.

Description

Mode switching control method and device of hybrid vehicle and vehicle
Technical Field
The present disclosure relates to the field of hybrid vehicles, and in particular, to a mode switching control method and apparatus for a hybrid vehicle, and a vehicle.
Background
In the field of hybrid vehicles of related two-speed hybrid transmission (DHT), the vehicle can realize switching among a plurality of operating modes, including an electric drive mode, a series drive mode, and a hybrid drive mode, which can realize automatic switching. The automatic switching can be realized among all the driving modes through the control of the speed change controller.
The Vehicle Control Unit (VCU) judges the optimal running mode of the vehicle according to the power demand of a driver for driving the vehicle and the self state (factors such as vehicle speed, power of a power storage battery and the like) of the vehicle, and under the pure electric driving mode and the series driving mode, an engine and a transmission do not directly participate in the driving of the vehicle, and the vehicle is driven to run only by a driving motor. In hybrid drive mode, the engine transfers power directly through the transmission to the wheels. Therefore, when the vehicle is switched to the hybrid drive mode under the operation conditions of the pure electric drive mode or the series drive mode, it is necessary to perform operations such as engagement of a synchronizer and engagement of a clutch of the transmission.
In the process of engaging a gear, the synchronizer has a certain limitation requirement on the speed difference between two ends of the synchronizer, if the vehicle speed is high, the direct engaging action of the synchronizer at a high speed will cause the situation that the engaging action cannot be completed due to the overlarge speed difference, that is, if the driving mode switching is required at a high speed, the engaging action may not be realized due to the limitation of the capability of the synchronizer.
Disclosure of Invention
The invention aims to provide a mode switching control method and device of a hybrid vehicle and the vehicle, which aim to solve the problem that the driving mode switching of the vehicle in the prior related art during high-speed running can not be realized due to the limitation of the capacity of a synchronizer.
In order to achieve the above object, the present disclosure provides a mode switching control method of a hybrid vehicle, the method including:
acquiring current running state information of the hybrid vehicle;
under the condition that the transmission gear of the hybrid vehicle is in a neutral gear, if the running state information represents that the front driving mode of the hybrid vehicle is a non-hybrid driving forward mode and the current vehicle speed reaches a speed limit value, executing a pre-gear operation to switch the transmission gear from the neutral gear to a second gear;
and under the condition that the transmission gear of the hybrid vehicle is in a second gear, if the running state information meets a preset driving mode switching condition, switching the hybrid vehicle from a non-hybrid driving mode to a hybrid driving mode.
Optionally, when the transmission gear of the hybrid vehicle is in the second gear, if the driving state information indicates that the current driving mode of the hybrid vehicle is the hybrid driving mode and the current vehicle speed of the hybrid vehicle is less than the speed limit, a downshift operation is performed to switch the transmission gear from the second gear to the neutral gear.
Optionally, the hybrid vehicle includes a transmission controller and an electronic stability system, and the step of acquiring the current driving state information of the hybrid vehicle includes:
determining a current driving mode of the hybrid vehicle and gear information in the current driving mode according to an electric signal of the speed change controller;
determining the current speed of the hybrid vehicle and the current finished vehicle required power according to an electric signal of the electronic stability system, wherein the running state information comprises the current driving mode, the gear information, the current speed and the current finished vehicle required power, and the current finished vehicle required power is used for judging whether the current vehicle needs to be switched to the hybrid driving mode;
the driving mode switching conditions are as follows: the running state information represents that the hybrid vehicle is in a non-hybrid-driven forward mode, the current vehicle speed is in a preset speed interval, and the current power demand of the whole vehicle is in an economic running interval.
Optionally, the hybrid vehicle includes a transmission controller, an electronic stability system, and a synchronizer electrically connected to the transmission controller, and the step of executing the pre-shift operation includes:
And sending the pre-gear-engagement instruction to the variable speed controller, wherein the pre-gear-engagement instruction is used for indicating the variable speed controller to control the synchronizer to perform the pre-gear-engagement operation.
Optionally, the transmission controller is configured to re-send the pre-engagement command to the transmission controller upon receiving an engagement failure message sent by the transmission controller to respond to the pre-engagement command.
Optionally, the speed limit is determined by:
acquiring a maximum speed difference preset in a synchronizer of the hybrid vehicle;
and setting the speed limit value according to the maximum speed difference, so that the speed difference between the two ends of the synchronizer is smaller than the maximum speed difference when the speed of the hybrid vehicle reaches the speed limit value.
Optionally, the hybrid vehicle includes a transmission controller and a clutch electrically connected to the transmission controller, and the step of switching the hybrid vehicle from the non-hybrid drive mode to the hybrid drive mode includes:
and sending a mode switching instruction to the speed change controller, wherein the mode switching instruction is used for instructing the speed change controller to control the clutch to be connected with an engine of the hybrid vehicle, so as to complete the operation of switching from the pure electric driving mode or the series driving mode to the hybrid power mode.
The present disclosure also provides a mode switching control apparatus of a hybrid vehicle, the apparatus including:
the acquisition module is used for acquiring the current running state information of the hybrid vehicle;
the processing module is used for executing a pre-gear operation to switch the transmission gear from the neutral gear to a second gear if the running state information represents that the hybrid vehicle front driving mode is a non-hybrid driving forward mode and the current vehicle speed reaches a speed limit value under the condition that the transmission gear of the hybrid vehicle is the neutral gear;
and the switching module is used for switching the hybrid vehicle from a non-hybrid driving mode to a hybrid driving mode if the running state information meets a preset driving mode switching condition under the condition that the transmission gear of the hybrid vehicle is in a second gear.
Alternatively, the step of acquiring the current running state information of the hybrid vehicle by the acquisition module of the device comprises:
determining a current driving mode of the hybrid vehicle and gear information in the current driving mode according to an electric signal of the speed change controller;
Determining the current speed of the hybrid vehicle and the current finished vehicle required power according to an electric signal of the electronic stability system, wherein the running state information comprises the current driving mode, the gear information, the current speed and the current finished vehicle required power, and the current finished vehicle required power is used for judging whether the current vehicle needs to be switched to the hybrid driving mode;
the driving mode switching conditions are as follows: the running state information represents that the hybrid vehicle is in a non-hybrid-driven forward mode, the current vehicle speed is in a preset speed interval, and the current power demand of the whole vehicle is in an economic running interval.
Optionally, the step of the device processing module performing a pre-shift operation comprises:
and sending the pre-gear-engagement instruction to the variable speed controller, wherein the pre-gear-engagement instruction is used for indicating the variable speed controller to control the synchronizer to perform the pre-gear-engagement operation.
Optionally, the processing module is further configured to, upon receiving a gear engagement failure message sent by the gear shift controller to respond to the pre-engagement command, resend the pre-engagement command to the gear shift controller.
Optionally, the speed limit of the device is determined by:
acquiring a maximum speed difference preset in a synchronizer of the hybrid vehicle;
and setting the speed limit value according to the maximum speed difference, so that the speed difference between the two ends of the synchronizer is smaller than the maximum speed difference when the speed of the hybrid vehicle reaches the speed limit value.
Alternatively, the step of the switching module switching the hybrid vehicle from the non-hybrid drive mode to the hybrid drive mode comprises:
and sending a mode switching instruction to the speed change controller, wherein the mode switching instruction is used for instructing the speed change controller to control the clutch to be connected with an engine of the hybrid vehicle, so as to complete the operation of switching from the pure electric driving mode or the series driving mode to the hybrid power mode.
Optionally, the switching module is further configured to:
and under the condition that the transmission gear of the hybrid vehicle is in a second gear, if the running state information represents that the current driving mode of the hybrid vehicle is a hybrid driving mode and the current vehicle speed of the hybrid vehicle is smaller than the speed limit value, executing a gear-reversing operation to switch the transmission gear from the second gear to a neutral gear.
The present disclosure also provides a hybrid vehicle including a transmission controller and an electronic stability system, and a mode switching control device electrically connected to the transmission controller and the electronic stability system, the mode switching control device being configured to execute the mode switching control method of the hybrid vehicle.
Through the technical scheme, the following effects can be at least achieved:
compared with the prior art, the vehicle control unit sends a mode switching instruction when detecting that the vehicle needs to be switched between modes, the instruction is used for indicating the transmission controller synchronizer to be in gear and the clutch to be engaged, and the driving mode of the vehicle is switched after the gear is successfully engaged, however, the vehicle speed may exceed the limit of the speed difference of the two ends of the synchronizer at the moment, the synchronizer is likely to be out of gear, and further the vehicle operation mode switching is likely to fail.
When the vehicle reaches the standard value (namely the speed limit value) of the system set based on the maximum speed difference accepted by the synchronizer, the pre-gear instruction is sent out to control the transmission to perform pre-gear operation, so that when the vehicle runs at high speed and the running state needs to be switched to a hybrid power mode, mode switching can be directly performed without further gear switching, the condition of gear switching failure caused by synchronizer performance limitation is avoided, normal mode switching can be realized under the condition that the vehicle runs at high speed, and the vehicle performance is improved.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a flowchart of a mode switching control method of a hybrid vehicle;
FIG. 2 is another flowchart of a mode switching control method of a hybrid vehicle;
FIG. 3 is another flowchart of a mode switching control method of a hybrid vehicle;
fig. 4 is a block diagram of a mode switching control apparatus of a hybrid vehicle;
fig. 5 is a block diagram of a hybrid vehicle.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
In order to enable those skilled in the art to quickly understand the improvement of the technical solution provided by the embodiment of the present disclosure compared with the prior art, a method for controlling mode switching of a hybrid vehicle in the related art is first described, wherein the hybrid vehicle may be a hybrid vehicle equipped with a two-speed hybrid transmission (DHT).
The automobile can realize switching among various working modes, wherein the automobile can comprise a pure electric driving mode, a series driving mode and a hybrid driving mode. The driving modes can be automatically switched through the control of the controller, so that the dynamic property and the economical efficiency of the vehicle are improved.
The Vehicle Control Unit (VCU) judges the optimal driving mode of the vehicle according to the power demand of a driver for driving the vehicle and the self state of the vehicle, including the vehicle speed, the electric quantity of a power storage battery and other factors, and under the pure electric driving mode and the series driving mode, an engine and a transmission do not directly participate in the driving of the vehicle, and the vehicle is driven to run only by a driving motor. While in hybrid drive mode, the engine transfers power directly through the transmission to the wheels. Therefore, when the vehicle is switched to the hybrid drive mode under the operating conditions of the electric drive mode or the series drive mode, it is necessary to perform operations such as engagement of a synchronizer and engagement of a clutch of the transmission.
In the process of engaging the gear, the synchronizer has certain limiting requirements on the speed difference of two ends of the synchronizer, if the speed of the vehicle is high, the synchronizer can directly engage the gear, and the situation that the gear cannot be engaged due to the overlarge speed difference can occur, namely, the vehicle can not be switched to a hybrid power driving mode due to the limitation of the capacity of the synchronizer in a high-speed driving state.
In order to solve the above technical problem, an embodiment of the present disclosure provides a mode switching control method for a hybrid vehicle, which may be applied to, for example, a VCU of the hybrid vehicle, as shown in fig. 1, and includes:
and S11, acquiring the current running state information of the hybrid vehicle.
The driving state information can comprise a driving mode of a current gear of the vehicle, gear information under the current driving mode, a current vehicle speed and current required power of the whole vehicle, wherein the required power of the whole vehicle can comprise required driving power and required power of electric accessories, and the required driving power can be the required driving power of the vehicle under the current working condition, which is obtained by converting acquired stroke amounts of an accelerator pedal and a brake pedal of the whole vehicle controller into electric signals and calculating according to the electric signals; the power demand of the powered accessories may be determined by the vehicle control unit based on the operating state of the various powered accessories on the vehicle.
And S12, if the driving state information indicates that the hybrid vehicle front driving mode is a non-hybrid driving forward mode and the current vehicle speed reaches the speed limit value, executing a pre-gear operation to switch the transmission gear from the neutral gear to the second gear.
Taking a two-gear hybrid special transmission as an example, the transmission gears include a neutral gear, a first gear and a second gear, and the speed limit value may be a speed value calibrated in advance to match the second gear, that is, when the vehicle speed reaches the speed value, the transmission gears can be smoothly switched from the neutral gear to the second gear. The drive modes of the hybrid vehicle may include a hybrid drive mode, a series drive mode, and an electric drive mode.
And S13, if the running state information satisfies the preset driving mode switching condition when the transmission gear of the hybrid vehicle is in the second gear, switching the hybrid vehicle from the non-hybrid driving mode to the hybrid driving mode. The preset driving mode switching condition can be that the vehicle speed is increased to a certain interval, a driver does not need strong power, and the conditions of the operation of the engine and an economic area are just met.
That is to say, the technical scheme of the embodiment of the present disclosure increases a speed limit value for the condition of mode switching control, so that the vehicle performs pre-engagement operation when reaching the speed, and then when the vehicle speed is higher than the speed limit value and needs to be switched to the hybrid drive mode, the synchronizer is already engaged, and the clutch can be directly engaged, so that the condition of mode switching failure caused by the fact that the vehicle cannot be engaged due to the limitation of the performance of the synchronizer does not occur, and further the power performance and the economy of the vehicle are effectively improved.
Alternatively, on the basis of the method shown in fig. 1, the step of acquiring the current running state information of the hybrid vehicle may include:
determining a current driving mode of the hybrid vehicle and gear information under the current driving mode according to an electric signal of a speed change controller;
determining the current speed of the hybrid vehicle and the current vehicle demand power according to an electric signal of an electronic stability system, wherein the running state information comprises the current driving mode, the gear information, the current speed and the current vehicle demand power, and the current vehicle demand power is used for judging whether the current vehicle needs to be switched into the hybrid driving mode;
the driving mode switching condition may be: the driving state information represents that the hybrid power vehicle is in a non-hybrid power driven forward mode, the current vehicle speed is in a preset speed interval, the current vehicle demand power is in an economic operation interval, and the hybrid power battery is switched to ensure the economical efficiency of vehicle operation on the premise of ensuring the vehicle power.
Optionally, the step of performing the pre-shift operation may include:
and sending the pre-gear-engagement instruction to the variable speed controller, wherein the pre-gear-engagement instruction is used for indicating the variable speed controller to control the synchronizer to perform the pre-gear-engagement operation.
Optionally, in the case of receiving a gear engagement failure message sent by the transmission controller for responding to the pre-gear engagement command, the pre-gear engagement command is sent to the transmission controller again, so that the gear engagement operation can be carried out again in time in the case of gear engagement failure, and mode switching failure is avoided.
Alternatively, the speed limit may be determined as follows:
acquiring a maximum speed difference preset in a synchronizer of the hybrid vehicle;
and setting the speed limit value according to the maximum speed difference, so that the speed difference of two ends of the synchronizer is smaller than the maximum speed difference under the condition that the speed of the hybrid vehicle reaches the speed limit value, thereby ensuring that the vehicle is in a range allowed by the performance of the synchronizer when the speed is in gear, and avoiding frequent gear shifting caused by excessively small speed limit value.
Alternatively, the step of switching the hybrid vehicle from the non-hybrid drive mode to the hybrid drive mode includes:
and sending a mode switching command to the speed change controller, wherein the mode switching command is used for instructing the speed change controller to control the clutch to be engaged with an engine of the hybrid vehicle, so as to complete the operation of switching from the pure electric drive mode or the series drive mode to the hybrid mode.
In order to further understand the mode switching control method provided by the embodiment of the present disclosure, the following detailed description of the embodiment of the present disclosure is directed to a mode switching control method of a hybrid vehicle:
fig. 2 is another flowchart of a mode switching control method provided in an embodiment of the present disclosure, and as shown in the figure, the method includes:
and S21, acquiring the current running state information of the hybrid vehicle.
And S22, if the driving state information indicates that the hybrid vehicle front driving mode is a non-hybrid driving forward mode and the current vehicle speed reaches the speed limit value, executing a pre-gear operation to switch the transmission gear from the neutral gear to the second gear.
And S23, if the running state information indicates that the current driving mode of the hybrid vehicle is the hybrid driving mode and the current vehicle speed of the hybrid vehicle is less than the speed limit value of the vehicle, executing a gear-reversing operation to switch the gear position of the transmission from the second gear to the neutral gear under the condition that the gear position of the transmission of the hybrid vehicle is the second gear.
In specific implementation, the condition for executing the downshift may be: the running state information represents that the current driving mode of the hybrid vehicle is a hybrid driving mode, and the current vehicle speed of the hybrid vehicle is smaller than the speed limit value of the vehicle and is kept for 3 seconds. Wherein, holding for 3 seconds may be a time set by a person, which is not limited by the embodiments of the present disclosure.
By adopting the method, the gear of the transmission can be returned to the zero gear under the condition that the current speed of the vehicle is less than the speed limit value of the vehicle, the condition that the vehicle is switched to a hybrid power driving mode under the condition of low-speed running of the vehicle is avoided, the gear of the transmission of the vehicle is also a high gear, and carbon deposition is easily formed in the engine by the high-gear low-speed running, so that the service life of the engine is prolonged.
Fig. 3 is a flowchart of another mode switching control method provided in an embodiment of the present disclosure, in which a speed limit is set to 105kph (kilometer per hour), and the hybrid vehicle is a hybrid vehicle equipped with a two-speed hybrid transmission, and the vehicle has three driving modes, including an electric-only driving mode, a series driving mode, and a hybrid driving mode. The vcu (vehicle Control unit) indicates a vehicle controller, the tcu (transmission Control unit) indicates a transmission controller, and the D-range indicates that the vehicle is in a forward gear.
As can be seen from steps S300, S301, S302, S303, S304, S305, S306, S307, S308, and S309, after the vehicle is successfully engaged, if the vehicle driving state does not satisfy the condition for switching to the hybrid drive mode and the vehicle speed is less than 105kph for more than 5 seconds, the transmission gear is returned to the neutral gear, so that it is avoided that the vehicle is switched to the hybrid drive mode in the case of low-speed driving, the transmission gear is still the high gear, and the high-speed driving and the low-speed driving easily cause carbon deposition inside the engine, thereby being beneficial to the service life of the engine.
According to the steps S300, S301, S302, S303, S304, S305, S306, S307, S310, S311, S312, S313, S314, S315, and S316, when the current vehicle speed is greater than the preset speed limit, the current vehicle driving mode is the series driving mode or the pure electric driving mode, and the current vehicle is the forward gear, the vehicle control unit of the vehicle sends a pre-shift request, the transmission controller receives the pre-shift request and executes it, if the vehicle driving state meets the condition of switching to the hybrid driving mode after the gear is successfully shifted, the vehicle control unit sends a mode switching command, the transmission controller receives and executes the mode switching request, and the whole mode switching process is finished after the gear is successfully shifted. The method also comprises a feedback mechanism of steps S304 and S305, and S312 and S313, so that complete execution of the pre-gear request and the driving mode switching request sent by the vehicle controller is ensured.
Based on the same inventive concept, the disclosed embodiment further provides a mode switching control device 40 of a hybrid vehicle, configured to execute the steps of the mode switching control method provided by the above method embodiment, where the mode switching control device 40 may implement a vehicle control unit on the hybrid vehicle in a software manner, a hardware manner, or a combination of the two manners, as shown in fig. 4, and the mode switching control device 40 includes:
The acquiring module 41 is used for acquiring the current running state information of the hybrid vehicle;
the processing module 42 is configured to, when the transmission gear of the hybrid vehicle is a neutral gear, if the driving state information indicates that the hybrid vehicle front driving mode is a non-hybrid driving forward mode and a current vehicle speed reaches a speed limit, perform a pre-shift operation to switch the transmission gear from the neutral gear to a second gear;
and a switching module 43, configured to switch the hybrid vehicle from the non-hybrid driving mode to the hybrid driving mode if the driving state information meets a preset driving mode switching condition when the transmission gear of the hybrid vehicle is in the second gear.
By adopting the mode switching control device 40, the speed limit value is set when the mode is switched to the hybrid power mode, the vehicle control unit sends a pre-gear-shifting instruction when the vehicle speed reaches the speed limit value, the synchronizer is shifted from the neutral gear to the second gear, after the shift is completed, if the driving requirement of the vehicle reaches the condition of correspondingly switching to the hybrid power driving mode, the mode switching can be completed without controlling the synchronizer to shift and only needing to engage the clutch, the mode switching blockage caused by the performance limitation of the synchronizer in the process of shifting the synchronizer when the mode is switched when the vehicle speed is too high is avoided, the driving requirement of a driver can be met, and the use economy of the vehicle is improved as much as possible.
Alternatively, the step of the acquiring module 41 acquiring the current running state information of the hybrid vehicle includes:
determining a current driving mode of the hybrid vehicle and gear information under the current driving mode according to an electric signal of a speed change controller;
determining the current speed of the hybrid vehicle and the current vehicle demand power according to an electric signal of an electronic stability system, wherein the running state information comprises the current driving mode, the gear information, the current speed and the current vehicle demand power, and the current vehicle demand power is used for judging whether the current vehicle needs to be switched into the hybrid driving mode;
the driving mode switching conditions are as follows: the running state information represents that the hybrid vehicle is in a non-hybrid-driven forward mode, the current vehicle speed is in a preset speed interval, and the current power demand of the whole vehicle is in an economic running interval.
Optionally, the step of the processing module 42 executing the pre-shift operation includes:
and sending the pre-gear instruction to the variable speed controller, wherein the pre-gear instruction is used for instructing the variable speed controller to control the synchronizer to perform the pre-gear operation.
Optionally, the processing module 42 is further configured to resend the pre-engagement command to the transmission controller upon receiving an engagement failure message sent by the transmission controller to respond to the pre-engagement command.
Optionally, the speed limit of the vehicle on which the device 40 is mounted is determined by:
acquiring a maximum speed difference preset in a synchronizer of the hybrid vehicle;
and setting the speed limit value according to the maximum speed difference, so that the speed difference between the two ends of the synchronizer is smaller than the maximum speed difference when the speed of the hybrid vehicle reaches the speed limit value.
Alternatively, the step of the switching module 43 switching the hybrid vehicle from the non-hybrid driving mode to the hybrid driving mode includes:
and sending a mode switching command to the speed change controller, wherein the mode switching command is used for instructing the speed change controller to control the clutch to be engaged with an engine of the hybrid vehicle, so as to complete the operation of switching from the pure electric drive mode or the series drive mode to the hybrid mode.
Optionally, the switching module 43 is further configured to:
and under the condition that the transmission gear of the hybrid vehicle is in the second gear, if the running state information represents that the current driving mode of the hybrid vehicle is the hybrid driving mode and the current vehicle speed of the hybrid vehicle is less than the speed limit value, executing a gear-reversing operation to switch the transmission gear from the second gear to the neutral gear.
Based on the same inventive concept, as shown in fig. 5, the disclosed embodiment further provides a hybrid vehicle 50, which includes a transmission controller 51, an electronic stability system 52 and a mode switching control device 40 electrically connected to the transmission controller and the electronic stability system, wherein the mode switching control device 40 is used for executing a mode switching control method of the hybrid vehicle, and it should be understood by those skilled in the art that the hybrid vehicle further includes other components in specific implementation, fig. 5 only shows the parts related to the disclosed embodiment, and other necessary vehicle components are not shown one by one.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure. For example, a speed limit of 105kph may be changed to a speed limit of 120 kph.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. A mode switching control method of a hybrid vehicle, characterized by comprising:
acquiring current running state information of the hybrid vehicle;
under the condition that the transmission gear of the hybrid vehicle is in a neutral gear, if the running state information represents that the current driving mode of the hybrid vehicle is a non-hybrid driving forward mode and the current vehicle speed reaches a speed limit value, executing a pre-gear operation to switch the transmission gear from the neutral gear to a second gear;
and under the condition that the transmission gear of the hybrid vehicle is in a second gear, if the running state information meets a preset driving mode switching condition, switching the hybrid vehicle from a non-hybrid driving mode to a hybrid driving mode.
2. The method of claim 1, further comprising:
and under the condition that the transmission gear of the hybrid vehicle is in a second gear, if the running state information represents that the current driving mode of the hybrid vehicle is a hybrid driving mode and the current vehicle speed of the hybrid vehicle is smaller than the speed limit value, executing a gear-reversing operation to switch the transmission gear from the second gear to a neutral gear.
3. The method according to claim 1, wherein the hybrid vehicle includes a transmission controller and an electronic stability system, and the step of acquiring the current running state information of the hybrid vehicle includes:
determining a current driving mode of the hybrid vehicle and gear information in the current driving mode according to an electric signal of the speed change controller;
determining the current speed of the hybrid vehicle and the current finished vehicle required power according to an electric signal of the electronic stability system, wherein the running state information comprises the current driving mode, the gear information, the current speed and the current finished vehicle required power, and the current finished vehicle required power is used for judging whether the current vehicle needs to be switched to the hybrid driving mode;
the driving mode switching conditions are as follows: the running state information represents that the hybrid vehicle is in a non-hybrid-driven forward mode, the current vehicle speed is in a preset speed interval, and the current power demand of the whole vehicle is in an economic running interval.
4. The method according to any one of claims 1-3, wherein the hybrid vehicle includes a transmission controller, an electronic stability system, and a synchronizer electrically connected to the transmission controller, and the step of performing a pre-shift operation includes:
And sending the pre-gear-engagement instruction to the variable speed controller, wherein the pre-gear-engagement instruction is used for instructing the variable speed controller to control the synchronizer to perform the pre-gear-engagement operation.
5. The method of claim 4, further comprising:
and under the condition of receiving a gear engaging failure message which is sent by the gear shifting controller and used for responding to the pre-gear engaging command, retransmitting the pre-gear engaging command to the gear shifting controller.
6. A method according to any of claims 1-3, characterized in that the speed limit is determined by:
acquiring a maximum speed difference preset in a synchronizer of the hybrid vehicle;
and setting the speed limit value according to the maximum speed difference, so that the speed difference between the two ends of the synchronizer is smaller than the maximum speed difference when the speed of the hybrid vehicle reaches the speed limit value.
7. The method of any of claims 1-3, wherein the hybrid vehicle includes a transmission controller and a clutch electrically connected to the transmission controller, and the step of switching the hybrid vehicle from the non-hybrid drive mode to the hybrid drive mode comprises:
And sending a mode switching instruction to the speed change controller, wherein the mode switching instruction is used for instructing the speed change controller to control the clutch to be connected with an engine of the hybrid vehicle, so as to complete the operation of switching from the pure electric driving mode or the series driving mode to the hybrid driving mode.
8. A mode switching control apparatus of a hybrid vehicle, characterized by comprising:
the acquisition module is used for acquiring the current running state information of the hybrid vehicle;
the processing module is used for executing a pre-gear operation to switch the transmission gear from the neutral gear to a second gear if the running state information represents that the hybrid vehicle front driving mode is a non-hybrid driving forward mode and the current vehicle speed reaches a speed limit value under the condition that the transmission gear of the hybrid vehicle is the neutral gear;
and the switching module is used for switching the hybrid vehicle from a non-hybrid driving mode to a hybrid driving mode if the running state information meets a preset driving mode switching condition under the condition that the transmission gear of the hybrid vehicle is in a second gear.
9. The apparatus of claim 8, wherein the switching module is further configured to:
and under the condition that the transmission gear of the hybrid vehicle is in a second gear, if the running state information represents that the current driving mode of the hybrid vehicle is a hybrid driving mode and the current vehicle speed of the hybrid vehicle is smaller than the speed limit value, executing a gear-reversing operation to switch the transmission gear from the second gear to a neutral gear.
10. A hybrid vehicle characterized by comprising a transmission controller and an electronic stability system, and mode switching control means electrically connected to the transmission controller and the electronic stability system for executing a mode switching control method of the hybrid vehicle according to any one of claims 1 to 7.
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